Translucent piezoelectric glass ceramic
a piezoelectric glass ceramic and transparent technology, applied in glass tempering apparatus, electrical apparatus, device material selection, etc., can solve the problems of enhanced scattering, glass devitrification increases optical loss, and the sample does not show typical ferroelectric hysteresis or dielectric constant peak, etc., to achieve the effect of orienting the piezo-active crystalli
Active Publication Date: 2007-08-30
SCHOTT AG
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Benefits of technology
The invention is about a new type of translucent piezoelectric glass ceramic that can be made through a ceraming process. This ceramic has non-ferroelectric piezo-active crystallites that are clearly piezoelectric and have an average crystal size of less than 1 micrometer. The ceramic can be made from a precursor glass that includes specific amounts of Li2O, B2O3, and SiO2. By controlling the average crystal size of the crystallites, the ceramic can have good translucency in both the visible and IR ranges. The ceramic can also be made from a precursor glass that includes specific amounts of Li2O, B2O3, and Na2O. The invention also provides a method for preparing the ceramic using a temperature gradient during the precipitation of the non-ferroelectric piezo-active crystallites. Overall, the invention provides a new way to make a translucent piezoelectric glass ceramic with good piezoelectric and translucent behavior.
Problems solved by technology
However, this is only a necessary condition for functionality, not a sufficient one.
However, such samples did not show typical ferroelectric hysteresis or dielectric constant peak at the ferroelectric transition temperature.
According to Jain in general, devitrification of glass increases optical loss from enhanced scattering.
However, this ferroelectricity was not demonstrated for a glass ceramic in general, but only for some devitrified samples.
Method used
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[0040]
TABLE 1Composition of examples and comparative examplesExample1, 234, 5, 6, 9, 107, 8CompositionLBO-15NGC-2NGC-6NGC-7Componentmol-%wt.-%mol-%wt.-%mol-%wt.-%mol-%wt.-%SiO260.071.142.021.045.522.635.016.5B2O36.79.2Li2O33.319.7Na2O29.014.913.67.032.515.8K2O13.610.6Nb2O529.064.127.359.832.567.7Total100.0100.0100.0100.0100.0
[0041]
TABLE 2Ceramization results for anisotropic samples(translucent and piezoelectric)Example12Tnuc (° C.)nonenonetnuc (hrs)nonenoneTgr (° C.)825825tgr (hrs)46q-heat (K / hr)300300q-cool (K / hr)300300Substrate Material½″ Graphite4″ Insulating Ceramic10″× 5″)Brick (10″× 5″)Surface FinishPolished FacesPolished Facesd33 (pC / N)5.75.0 / −3.2K33Processing MethodBrickRecessed BrickVisual AppearanceTranslucent up to 30%Translucent up to 30%TransmissionTransmissionXRDLi2Si2O5˜60nm58nmcrystal size (nm)Li2SiO3˜30nm32nmcrystal size (nm)Quartz˜100nm96nmcrystal size (nm)
[0042]
TABLE 3Ceramization results for poled samples(IR-translucent and piezoelectric)Example34567Tnuc (° C.)no...
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Abstract
A translucent piezoelectric glass ceramic is disclosed. The glass ceramic is prepared from a precursor glass by a ceraming process, using a temperature gradient to effect the precipitation of non-ferroelectric piezo-active crystallites from the precursor glass with a preferred direction of orientation and having an average crystal size of less than 1 micrometer. Alternatively, a translucent piezoelectric glass ceramic comprising ferroelectric crystallites may be prepared by poling. In this case the crystal size is controlled to be smaller than 90 nanometers but preferably larger than 10 nanometers.
Description
RELATED APPLICATIONS [0001] This application is based on U.S. provisional application Ser. No. 60 / 764,036 filed on Feb. 1, 2006 the contents of which are fully incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] The invention relates to a piezoelectric glass ceramic which is translucent at least in the visible light range or in the infrared range. [0003] The invention relates to a piezoelectric glass ceramic which is translucent at least in the visible light range or in the infrared range. [0004] Piezoelectric materials are intensively used worldwide, due to their unique material's performance. Piezoelectric glass ceramic materials provide an interesting and promising alternative to conventional piezoelectric materials such as PZT ceramics. Since PZT apart from zirconium and titanium contains lead, piezoelectric glass ceramics have a potential to replace PZT as an alternative lead-free material. [0005] The term piezoelectricity refers to the ability of a material to ...
Claims
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IPC IPC(8): H01L41/18C03C10/00C03C10/14C03C10/04C03C10/02H10N30/85H10N30/853
CPCC03B32/02H01L41/18C03C10/0054C03C10/0009H10N30/852
InventorGUDGEL, KATHERINE ANNBLAUM, PETERDAVIS, MARK J.VULLO, PAULA
OwnerSCHOTT AG